Question

I have a Spring Bean which has a @Autowired setter getter injection. However, when i try to access injected bean, i get NullPointerException because the injected bean has not be really injected.

Is there any way to guarantee that the injection is done before constructure call?

@Component
@Scope("session")
public class A{

@Autowired
B;

public A()
{
//B is null here, because it has not been injected yet.
}

//Setter Getters
}

Answer 1

Use the @PostConstruct annotation. This will be called right after Spring initializes your bean.

@Autowired
B b;

public A() {
}

@PostConstruct
public void doAfterConstructorIsCalled() {
    b.do();
}

It’s from the javax.* API